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Research Papers

Adaptive Control of Mechanical Gas Face Seals With Rotor Runout and Static Stator Misalignment

[+] Author and Article Information
Haojiong Zhang

 Danfoss Drives, 4401 North Bell School Road, Loves Park, IL 61111haojiongz@danfoss.com

Robert G. Landers1

 Missouri University of Science and Technology, 400 West 13th Street, Rolla, MO 65409landersr@mst.edu

Brad A. Miller

 Harding University, 915 East Market Avenue, Searcy, AR 72143bmiller7@harding.edu

1

Corresponding author.

J. Dyn. Sys., Meas., Control 132(4), 041009 (Jun 17, 2010) (10 pages) doi:10.1115/1.4001708 History: Received November 10, 2008; Revised March 21, 2010; Published June 17, 2010; Online June 17, 2010

This paper presents a control methodology that utilizes a robust model reference adaptive control technique to regulate the dynamic behavior of a coned mechanical gas face seal system in a flexibly mounted stator configuration. Individual adaptive controllers are designed for the three stator rigid body degrees of freedom based on the linear portions of their respective equations of motion. The force and moments generated within the gas film are estimated using Kalman filter-based estimators and directly cancelled in the control algorithm using offset control signals. The estimation errors are considered as bounded disturbances to the seal system and are taken into account by the robust adaptive controllers. Simulation results show that the controllers effectively stabilize the stator motion and control the stator tilts to synchronously track the rotor runout with near-zero relative misalignment magnitude and phase shift, thus, minimizing gas leakage.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mechanical gas face seal schematic in a flexibly mounted stator configuration

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Figure 2

(a) Mechanical gas face seal kinematic model in flexibly mounted stator configuration and (b) mechanical seal with seal faces aligned showing coning angle β

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Figure 3

Block diagram of MRAC controller structure for relative degree n∗=2

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Figure 4

Seal responses with and without control for C0=4 μm, γr=γm=0 rad, Ż(0)=0 m/s, and γ̇X(0)=γ̇Y(0)=0.1 rad/s: (a) stator axial clearance responses, (b) stator tilt responses, (c) control signal responses, and (d) controller parameter responses

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Figure 7

Seal responses with and without control at equilibrium clearance C0=2 μm, different rotor runout and static stator misalignments, Z(0)=0 m, Ż(0)=0.2 m/s and γX(0)=γr, and γ̇X(0)=0 rad/s and γ̇Y(0)=Ω•γr: (a) uncontrolled stator axial clearance responses, (b) controlled stator axial clearance responses, (c) uncontrolled stator tilt responses, (d) controlled stator responses, (e) uncontrolled relative phase shift responses, (f) controlled relative phase shift responses, (g) uncontrolled gas leakages, and (h) controlled gas leakages

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Figure 6

Seal responses with and without control at equilibrium clearance C0=4 μm with different rotor runout magnitudes and static stator misalignments, Ż(0)=0 m/s, and γ̇X(0)=γ̇Y(0)=0.1 rad/s: (a) uncontrolled stator axial clearance responses, (b) controlled stator axial clearance responses, (c) uncontrolled relative misalignment magnitude responses, (d) controlled relative misalignment magnitude responses, (e) uncontrolled relative phase shift responses, (f) controlled relative phase shift responses, (g) uncontrolled gas leakages, and (h) controlled gas leakages

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Figure 5

Seal responses with and without control for C0=2 μm, γr=γm=0 rad, Ż(0)=0 m/s, and γ̇X(0)=γ̇Y(0)=0.1 rad/s and boundary pressure at the outside seal radius increases from 0.2 MPa to 0.21 MPa at t=0.1 s: (a) stator axial clearance responses, (b) stator tilt responses, (c) control signal responses, and (d) controller parameter responses

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